Many refers CoH to City of Heroes but it's also shortness for the very popular RTS-game Company of Heroes.

Company of Heroes (CoH) is a real-time strategy (RTS) computer game developed for Microsoft Windows by Relic Entertainment. It was announced on April 25, 2005, released on September 14, 2006, and was the first title to make use of the Games for Windows label. The game was released on Steam on July 17, 2007.

A standalone expansion, Company of Heroes: Opposing Fronts, was released on September 24, 2007.

City of Heros. An online multiplayer game in which you are a super hero. You can pick from many different super powers and can chose a sweet unique costume. The takes place in Paragon City and you can help stop old ladies from getting their purse stolen or the 5th Column (Neo Nazis) from taking over the entire city.